Dust collector



H. W. CURTIS DUST COLLECTOR March 27, '1945.

Filed March 5, 1943 e a T T y MM Mar; 27, 1945 nUs'r coLLnc'roa HaroldW. .Curtis, Stoughton, Mass, assignor B. F. Sturtevant Company, Boston,Mass.

"application March 5, Q1943, Serial No. 478,088

7 2 Claims.

This provision relates to dust collectors and has as an object theprovision of a rugged, emcient collector which may be inserted at theinlet or an induced draft fan for removing dust entrained in the gasmoved by the fan.

Cyclone type dust collectors are generally used for connection to theinduced draft fans of, for

- example, steam power plants for removing cinaway, along the lines 2-2of Fig. 1, and

Fig. 3 is an enlarged sectional view of one of the nozzles and itsassociated tubes of Fig. 1.

The casing 5 has extending upwardly therefrom, the gas inlet duct 8, andhas the dust hopper 7 extending downwardly therefrom in alignment withthe duct 6.

The outlet duct 6 extends the width and depth oi the casing, has itsinner end connected thereunto and extends therefrom for connection atits outer end as to an induced draft tan.

At the connection of the inlet duct 6 to the casing l, the plate 9extends therebetween and contains the plurality of converging nozzles II. The cylindrical tubes ii are mounted in the casing 5 below and inalignment with the nozzles, the interiors of the tubes ll beingsubstantially larger than the lower ends of the nozzles.

The plate #2 which supports the tubes Ii from the sides of the casing 5and which separates the space within the casing around the tubes fromthe hopper, extends into the outlet duct 8 to overlap a portion'or thelower wall I 3 of the duct 8. forming a, recirculated air passage H inwhich is mounted the adjustable damper it.

As the gas and entrained dust from the inlet duct 6 passes through thenozzles Ill, the velocity is increased and although the larger portionof the gas is drawn from the nozzles and around the exteriors or thetubes ii, the dust particles are given suiilcient momentum to cause themto pass through the tubes ii into the hopper 1.

The dust free gas from the hopper is drawn therefrom through the passageit. the

damper II. The damper it is adjusted to provide suiiicient suctionthrough the passage to provide a slight negative pressure therein foriacilitating the dust collection and for providing recirculation, yetlnsu'flicient to cause the dust particles from the hopper l to be drawninto the outlet duct.

While one embodiment of the invention has been described for the purposeof illustration, it should be understood that the invention is'notlimited to the exact apparatus and arrangement of apparatus illustratedas modification therefrom may be suggested by those skilled in the artwithout departure from the essence'of the invention.

What is claimed is:

1. A dust collector comprising a casing, a plurality of spaced,substantially vertically extending tubes in said casing, a dust hopperattached to said casing below said tubes, at substantially horizontalplate extending across said casing above said tubes, means forming aplurality of relatively small nozzles in said plate aligned with saidtubes, an outlet duct having a substantially horizontal lower wallattached to said hopper and having a substantially horizontal upper'wallattached to said plate, and a substantially horizontal partitionextending across said casing above said lower wall of said duct, saidpartition having perforations therein through which said tubes extend,said partition and said lower wall forming a passage into said outletduct for dust free gas from said hopper,

2. A dust collector comprising a casing, a plurality of spaced.substantially vertically extending tubes in said casing, a dust hopperattached to said casing below said tubes, a substantially horizontalplate extending across said casing above Said' tubes, means forming aplurality of relatively small nozzles in said plate aligned with saidtubes, an outlet duct having a substantially I horizontal lower wallattached to said hopper and having a substantially horizontal upper wallattached to said plate, a substantially horizontal partition extendingacross said casing above said lower wall of said duct, said partitionhaving perforations therein through which said tubes extend, saidpartition having a Portion extending into said duct overlapping saidlower wall, and

a. damper between said portion of said partitionv and said lower wall,said partition and said lower wall forming a passage into said outletduct dust free gas from said hopper.

HAROLD W. CURTIS.

